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Title: Self-generated concentration and modulus gradient coating design to protect Si nano-wire electrodes during lithiation

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C5CP07219K· OSTI ID:1387538
 [1];  [2];  [2];  [3];  [4];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Pennsylvania State Univ., University Park, PA (United States)
  3. General Motors Global Research & Development Center, Warren, MI (United States)
  4. Brown Univ., Providence, RI (United States)

Surface coatings as artificial solid electrolyte interphases have been actively pursued as an effective way to improve the cycle efficiency of nanostructured Si electrodes for high energy density lithium ion batteries, where the mechanical stability of the surface coatings on Si is as critical as Si itself. However, the chemical composition and mechanical property change of coating materials during the lithiation and delithiation process imposed a grand challenge to design coating/Si nanostructure as an integrated electrode system. In our work, we first developed reactive force field (ReaxFF) parameters for Li–Si–Al–O materials to simulate the lithiation process of Si-core/Al2O3-shell and Si-core/SiO2-shell nanostructures. With reactive dynamics simulations, we were able to simultaneously track and correlate the lithiation rate, compositional change, mechanical property evolution, stress distributions, and fracture. A new mechanics model based on these varying properties was developed to determine how to stabilize the coating with a critical size ratio. Furthermore, we discovered that the self-accelerating Li diffusion in Al2O3 coating forms a well-defined Li concentration gradient, leading to an elastic modulus gradient, which effectively avoids local stress concentration and mitigates crack propagation. Finally, based on these results, we propose a modulus gradient coating, softer outside, harder inside, as the most efficient coating to protect the Si electrode surface and improve its current efficiency.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Nanostructures for Electrical Energy Storage (NEES)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office. Batteries for Advanced Transportation Technologies (BATT) Program; US Army Research Laboratory (USARL)
Grant/Contract Number:
SC0001160; AC02-05CH11231; 7056410
OSTI ID:
1387538
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 18, Issue 5; Related Information: NEES partners with University of Maryland (lead); University of California, Irvine; University of Florida; Los Alamos National Laboratory; Sandia National Laboratories; Yale University; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Atomistic Origins of Ductility Enhancement in Metal Oxide Coated Silicon Nanowires for Li-Ion Battery Anodes journal October 2017
Reactive molecular dynamics simulation of thermal decomposition for nano-AlH3/TNT and nano-AlH3/CL-20 composites journal January 2019
Artificial interphase engineering of electrode materials to improve the overall performance of lithium-ion batteries journal August 2017
Review on modeling of the anode solid electrolyte interphase (SEI) for lithium-ion batteries journal March 2018
Molecular dynamic simulation for thermal decomposition of RDX with nano-AlH 3 particles journal January 2018
Two-dimensional porous silicon nanosheets as anode materials for high performance lithium-ion batteries journal January 2019